#include <stdio.h>

double power(double x, int n) {
	if (n == 0) return 1;
	if (n & 1) return x * power(x, n - 1);
	return power(x * x, n >> 1);
}

int ynum[1000001];

int main() {
	int n; double p;
	int i, j;
	double ans = 0;
	
	scanf("%d%lf", &n, &p);
	for (i = 2; i <= n; i++) ynum[i] = 1;
	for (i = 2; i <= n; i++) {
		if (ynum[i] == 1) {
			for (j = i; j <= n; j += i) {
				int t = j, cnt = 0;
				while (t % i == 0) {
					t /= i;
					cnt++;
				}
				ynum[j] *= (cnt + 1);
			}
		}
		ans += power(1.0 - p, ynum[i] - 2);
	}
	printf("%.14f\n", ans);
	return 0;
}